diff --git a/pkgs/development/python-modules/atomiclong/default.nix b/pkgs/development/python-modules/atomiclong/default.nix
new file mode 100644
index 000000000000..8f3aae7b19dd
--- /dev/null
+++ b/pkgs/development/python-modules/atomiclong/default.nix
@@ -0,0 +1,21 @@
+{ stdenv, buildPythonPackage, fetchPypi, pytest, cffi }:
+
+buildPythonPackage rec {
+  pname = "atomiclong";
+  version = "0.1.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1gjbc9lvpkgg8vj7dspif1gz9aq4flkhxia16qj6yvb7rp27h4yb";
+  };
+
+  buildInputs = [ pytest ];
+  propagatedBuildInputs = [ cffi ];
+
+  meta = with stdenv.lib; {
+    description = "Long data type with atomic operations using CFFI";
+    homepage = https://github.com/dreid/atomiclong;
+    license = licenses.mit;
+    maintainers = with maintainers; [ robbinch ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 86bfe600fba3..de5c441cc46a 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -555,25 +555,7 @@ in {
 
   asn1ate = callPackage ../development/python-modules/asn1ate { };
 
-  atomiclong = buildPythonPackage rec {
-    version = "0.1.1";
-    name = "atomiclong-${version}";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/a/atomiclong/atomiclong-${version}.tar.gz";
-      sha256 = "1gjbc9lvpkgg8vj7dspif1gz9aq4flkhxia16qj6yvb7rp27h4yb";
-    };
-    buildInputs = with self; [ pytest ];
-    propagatedBuildInputs = with self; [ cffi ];
-
-    meta = {
-      description = "Long data type with atomic operations using CFFI";
-      homepage = https://github.com/dreid/atomiclong;
-      license = licenses.mit;
-      maintainers = with maintainers; [ robbinch ];
-    };
-
-  };
+  atomiclong = callPackage ../development/python-modules/atomiclong { };
 
   atomicwrites = buildPythonPackage rec {
     version = "0.1.9";